Oracle

Reprint to: http://www.cnblogs.com/gguozhenqian/p/4262813.htmlThere is a feature in the project that needs to get data from an Oracle database, which was thought to be very simple, and changed the original SqlClient into a OracleClient call.The

Today, when looking at a data sheet of a legacy system, we find that the view that we look for is a full-out join, which results in some restrictive processing of the data records, and can also be achieved by setting the view tables as right outer

Oracle built-in objects:Sequence sequence: generates an integer sequence that can often be used to populate a primary key column.To create a sequence:CREATE SEQUENCE sequence name[Start with start value ][INCREMENT by growth value ]When used: Two

Recently in the study of Oracle but in the process of installation problems, oneself also can not make, ask you big God, this How to get ah? 650) this.width=650; "src=" Http://img.baidu.com/hi/jx2/j_0041.gif "alt=" J_0041.gif "/>Linux 64-bitOracle 11

1, add table B, same structure as table A (with data)CREATE TABLE B as SELECT * from A;2, add Table B, and the a table structure is the same (without with data)CREATE TABLE B as SELECT * from A where 1=2;3, there is a table B and table A in the same

A data table is basically difficult to meet our query requirements, at the same time, all the data are saved in a table is obviously not a good database design, in order to avoid data redundancy, delete, update the exception, we usually need to

Development program, often encounter the left Join,inner join statement, join is a relational database system one of the important operations, relatively faster, so people generally prefer to choose join statement.However, some of the usages of

Installation of Oracle database This is not the case, there should be many online, but the Oracle database uninstallation can not find a more detailed description of the complete uninstall. A lot of uninstallation is incomplete, there will be legacy

Switchover is a master-slave library role switching, lossless conversion, usually the user manually triggered or planned to let it automatically trigger, such as hardware upgrades, software upgrades and the like. The failover is how to switch from

Auditing is the monitoring and recording of selected user actions, typically used to:U review suspicious activities. For example, the data is deleted by an unauthorized user, at which point the security administrator can decide to audit all

To see the size of the Oracle database table space, you need to increase the table space data files, in database Management , the lack of disk space is a problem that DBAs encounter, the problem is more common.--1, viewing the percentage of table

Original source(This is from the "Baidu Library" in the article written very good)PHP Operations Oracle Database (OCI Data abstraction layer)OCI (Oracle 8 call-interface) is a Database abstraction layer function built into PHP.The following are

1. Create a test table and prepare the test data[Email protected]> CREATE Table A (a number (1), b number (1), c number (1));[Email protected]> CREATE TABLE B (a number (1), D number (1), E number (1));[Email protected]> INSERT into a values (1,1,1);

Directory1) Basic2) Mathematical functions3) rownum4) Paging5) Time Processing6) Character function7) To_number8) Aggregation function9) Student Selection Course10) Library BorrowingBasic--New table: CREATE TABLE table1 (ID varchar (primary) key,

There are many ways to generate data files, but most of them are inefficient, and for large data warehouses, efficient export files are urgently needed:Here, the Shell+java method integrates the data file generation tools written by the old Bear,

I. Special symbol ASCII definitionBox Drawings Chr (9)NewLine character Chr (10)Carriage return Chr (13)UPDATE Tc_car_order Set Use_reason = REPLACE (' Use_reason ', Chr (9), ');UPDATE Tc_car_order Set Use_reason = REPLACE (' Use_reason ', Chr (10),

I. Temp table space roleThe primary purpose of the temporary tablespace is to provide temporary computing space when the database is sorted, manage indexes, access views, and so on, and the system will automatically clean up when the operation is

Summary of oracle accidental deletion data recovery methods and oracle accidental deletion data recovery If the user accidentally deletes/updates the data, there is no direct way for the user to recover the data, they must seek help from the DBA to

Size of the datafile recorded in the Oracle database datafile header Environment: Oracle Databae 12.1.0.2, rhel5.9 x86-64bit   [Oracle @ rhel59 orcl] $ pwd/u01/app/oracle/oradata/orcl [oracle @ rhel59 orcl] $ ls-lrttotal 2104544drwxr-x --- 2 oracle

Oracle foreign key cascade deletion and cascade updateCascading Deletion Oracle has three behaviors: no action (similar to RESTRICT), CASCADE, and set null. The following uses the student-class as an example to describe how to delete Foreign keys in